Let me in on the secret (if there is one)

How do you guys get rid of the..'.fishy' smell down there. My partner showers everyday and I see how good he washes it just still smells 😭 is there anything different you guys do to take care of yourselves? I really want to go down on him but the smell just turns on me. It hasn't always smelt like this it's just smelt of normal penis 😬